One must read what led up to this ambiguous statement in order to explain it.
ASV verse 4:
These are the generations of the heavens and of the earth when they were created, in the day that Jehovah God made earth and heaven.
In context, the statement in question aluded to the timeframe of just before day three when there was no sun and moon, etc and before the plants were made. Chapter one is the only consistently sequential record of creation.
BUZSAW B 4 U 2 C Y BUZ SAW.
The immeasurable present eternally extends the infinite past and infinitely consumes the eternal future.